MUST SHOW ALL WORK AND BE VERY DETAILED AND SPECIFIC. ALSO MUST SHOW ANY SORT OF

Question

MUST SHOW ALL WORK AND BE VERY DETAILED AND SPECIFIC. ALSO MUST SHOW ANY SORT OF DIAGRAM OF HOW THE ANSWER WAS FOUND AND EXPLAIN IT COMPLETELY:

1. Color blindness is a sex-linked recessive trait. A man and his wife who both have normal vision have a female child who is color blind and has Turner Syndrome (XO). Diagram this cross including the gametes that produced this child.

2. In humans, normal skin pigmentation is influenced by a dominant gene (C), which allows pigmentation to develop. All individuals who are homozygous for the recessive allele (c) are unable to produce an enzyme needed for melanin formation and are therefore referred to as albino. Two normal parents produce an albino child. What are the chances the next child will be an albino?

3. Chickens with shortened wings and legs are called "creepers." When creepers are mated to normal birds they produce creepers and normals with equal frequency. When creepers are mated to creepers they produce 2 creepers to 1 normal. Crosses between normal birds produce only normal progeny. How can these results be explained?

Explanation / Answer

1. Color blindness is a sex/X linked recessive trait.

XCXc

Xc

XC

XCXC (normal female)

XCXc (carrier female for color blindness)

y

XCy (normal son)

Xc y (affected son for color blindness)

XCXc

Xc

XC

XCXC (normal female)

XCXc (carrier female for color blindness)

y

XCy (normal son)

Xc y (affected son for color blindness)

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